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The β + /EC ratio in the decay of  120g I (T 1/2  = 1.35 h), i.e. the β +  emission intensity, was measured for the first time using a high purity  120g I source, which was produced by irradiation of 99.0% enriched  120 Te with 15 MeV protons, followed by a chemical separation of radioiodine. Both γ-ray and X-ray spectroscopy were applied. In the former case a comparison of the intensity of the annihilation radiation with that of the 1523 keV γ-ray of  120g I was done and in the latter case with that of the Κ α  or Κ β  X-ray of the daughter tellurium. Corrections for very small contributions of  121 I and  120m I impurities were evaluated. The literature values for the I β+  of  120g I range between 39 and 81%. Our measurements lead to a value of 56±3%.

Positron emission intensity in the decay of 120g I